A) the air above the upper face of the paper moves slower, which makes the press

Question

A) the air above the upper face of the paper moves slower, which makes the pressure lower than at the lower face.
B) the air above the upper face of the paper moves faster, which makes the pressure lower than at the lower face.
C) the air above the upper face of the paper moves faster, which makes the pressure higher than at the lower face.
D) the air above the upper face of the paper moves slower, which makes the pressure higher than at the lower face.
E) the air above the upper face of the paper moves faster but the pressure remains constant.

Explanation / Answer

That's the bernoulli's effect..

p+ 0.5 * * v^2 = constant..

when you blow air, v increases => p decreases.. lesser than the pressure below the paper

so, ans is B

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